DeviceList is empty

[drmelectronic]

The App was working fine, but I think that after a update of android when I try to print, in the DeviceList activity the screen stay in blank.
I was debugging, and I found what the mBTReceiver never is called, I'm trying to fix this bug but I'm sure that you solve faster.

Mi Android version: 9 PKQ1.180904.001
Xiaomi version(MIUI): 11.0.3.0 (PEIMIXM)

but I test in anothers phones with the same problem.